188 citations · 306 across the 6 of their papers we have counts for
6 papers
Improvements of the programmable quantum current generator for better traceability of electrical current measurements
Sophie Djordjevic, Ralf Behr, Dietmar Drung +2
A programmable quantum current generator based on the application of Ohm's law to quantum voltage and resistance standards has demonstrated a realization of the ampere from the ele…
Inter-laboratory nanoamp current comparison with sub-part-per-million uncertainty
Stephen Giblin, Dietmar Drung, Martin Goetz +1
An ultrastable low-noise current amplifier (ULCA) has been transferred between two laboratories, NPL and PTB, four times, with three of the transfers yielding a relative change in…
Electrometer calibration with sub-part-per-million uncertainty
Hansjörg Scherer, Dietmar Drung, Christian Krause +2
We performed calibrations of four different commercial picoammeters using the Ultrastable Low-noise Current Amplifier (ULCA) as a calibrator current source operated in the range be…
Direct Comparison of Fractional and Integer Quantized Hall Resistance
Franz J. Ahlers, Martin Götz, Klaus Pierz
We present precision measurements of the fractional quantized Hall effect where the quantized resistance in the fractional quantum Hall state at filling factor 1/3 was…
Comeback of epitaxial graphene for electronics: large-area growth of bilayer-free graphene on SiC
Mattias Kruskopf, Davood Momeni Pakdehi, Klaus Pierz +12
We present a new fabrication method for epitaxial graphene on SiC which enables the growth of ultra-smooth defect- and bilayer-free graphene sheets with an unprecedented reproducib…
Validation of a quantized-current source with 0.2 ppm uncertainty
Friederike Stein, Dietmar Drung, Lukas Fricke +11
We report on high-accuracy measurements of quantized current, sourced by a tunable-barrier single-electron pump at frequencies up to GHz. The measurements were performed wi…